Hi folks, I've attached "v5" of the system timezone patch, which is
updated for 5.3.0.
This contains the changes to parse zone.tab which I proposed in my
previous mail, and should fix the crash reported in the Debian bug
535770. It seems to work fine though I have not tested it exhaustively.
Further review and testing would be very welcome!
Regards, Joe
Add support for use of the system timezone database, rather
than embedding a copy. Discussed upstream but was not desired.
History:
r5: reverts addition of "System/Localtime" fake tzname.
updated for 5.3.0, parses zone.tab to pick up mapping between
timezone name, country code and long/lat coords
r4: added "System/Localtime" tzname which uses /etc/localtime
r3: fix a crash if /usr/share/zoneinfo doesn't exist (Raphael Geissert)
r2: add filesystem trawl to set up name alias index
r1: initial revision
--- php-5.3.0/ext/date/lib/parse_tz.c.systzdata
+++ php-5.3.0/ext/date/lib/parse_tz.c
@@ -20,6 +20,16 @@
#include "timelib.h"
+#ifdef HAVE_SYSTEM_TZDATA
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "php_scandir.h"
+#endif
+
#include <stdio.h>
#ifdef HAVE_LOCALE_H
@@ -31,7 +41,12 @@
#else
#include <strings.h>
#endif
+
+#ifndef HAVE_SYSTEM_TZDATA
#include "timezonedb.h"
+#endif
+
+#include <ctype.h>
#if (defined(__APPLE__) || defined(__APPLE_CC__)) && (defined(__BIG_ENDIAN__) || defined(__LITTLE_ENDIAN__))
# if defined(__LITTLE_ENDIAN__)
@@ -253,6 +268,427 @@ void timelib_dump_tzinfo(timelib_tzinfo
}
}
+#ifdef HAVE_SYSTEM_TZDATA
+
+#ifdef HAVE_SYSTEM_TZDATA_PREFIX
+#define ZONEINFO_PREFIX HAVE_SYSTEM_TZDATA_PREFIX
+#else
+#define ZONEINFO_PREFIX "/usr/share/zoneinfo"
+#endif
+
+/* System timezone database pointer. */
+static const timelib_tzdb *timezonedb_system = NULL;
+
+/* Hash table entry for the cache of the zone.tab mapping table. */
+struct location_info {
+ char code[2];
+ double latitude, longitude;
+ char name[64];
+ char *comment;
+ struct location_info *next;
+};
+
+/* Cache of zone.tab. */
+static struct location_info **system_zone_info;
+
+/* Size of the zone.tab hash table; a random-ish prime big enough to
+ * prevent too many collisions. */
+#define LOCINFO_HASH_SIZE (1021)
+
+static uint32_t tz_hash(const char *str)
+{
+ const unsigned char *p = (const unsigned char *)str;
+ uint32_t hash = 5381;
+ int c;
+
+ while ((c = *p++) != '\0') {
+ hash = (hash << 5) ^ hash ^ c;
+ }
+
+ return hash % LOCINFO_HASH_SIZE;
+}
+
+/* Parse an ISO-6709 date as used in zone.tab. Returns end of the
+ * parsed string on success, or NULL on parse error. On success,
+ * writes the parsed number to *result. */
+static char *parse_iso6709(char *p, double *result)
+{
+ double v, sign;
+ char *pend;
+ size_t len;
+
+ if (*p == '+')
+ sign = 1.0;
+ else if (*p == '-')
+ sign = -1.0;
+ else
+ return NULL;
+
+ p++;
+ for (pend = p; *pend >= '0' && *pend <= '9'; pend++)
+ ;;
+
+ /* Annoying encoding used by zone.tab has no decimal point, so use
+ * the length to determine the format:
+ *
+ * 4 = DDMM
+ * 5 = DDDMM
+ * 6 = DDMMSS
+ * 7 = DDDMMSS
+ */
+ len = pend - p;
+ if (len < 4 || len > 7) {
+ return NULL;
+ }
+
+ /* p => [D]DD */
+ v = (p[0] - '0') * 10.0 + (p[1] - '0');
+ p += 2;
+ if (len == 5 || len == 7)
+ v = v * 10.0 + (*p++ - '0');
+ /* p => MM[SS] */
+ v += (10.0 * (p[0] - '0')
+ + p[1] - '0') / 60.0;
+ p += 2;
+ /* p => [SS] */
+ if (len > 5) {
+ v += (10.0 * (p[0] - '0')
+ + p[1] - '0') / 3600.0;
+ p += 2;
+ }
+
+ /* Round to 3 decimal places. */
+ *result = round(v * sign * 1000.00)/1000.00;
+
+ return p;
+}
+
+/* This function parses the zone.tab file to build up the mapping of
+ * timezone to country code and geographic location, and returns a
+ * hash table. The hash table is indexed by the function:
+ *
+ * tz_hash(timezone-name)
+ */
+static struct location_info **load_zone_table(void)
+{
+ struct location_info **li, *i;
+ char zone_tab[PATH_MAX];
+ char line[512];
+ FILE *fp;
+
+ strncpy(zone_tab, ZONEINFO_PREFIX "/zone.tab", sizeof zone_tab);
+
+ fp = fopen(zone_tab, "r");
+ if (!fp) {
+ return NULL;
+ }
+
+ li = calloc(LOCINFO_HASH_SIZE, sizeof *li);
+
+ while (fgets(line, sizeof line, fp)) {
+ char *p = line, *code, *name, *comment;
+ uint32_t hash;
+ double latitude, longitude;
+
+ while (isspace(*p))
+ p++;
+
+ if (*p == '#' || *p == '\0' || *p == '\n')
+ continue;
+
+ if (!isalpha(p[0]) || !isalpha(p[1]) || p[2] != '\t')
+ continue;
+
+ /* code => AA */
+ code = p;
+ p[2] = 0;
+ p += 3;
+
+ /* coords => [+-][D]DDMM[SS][+-][D]DDMM[SS] */
+ p = parse_iso6709(p, &latitude);
+ if (!p) {
+ continue;
+ }
+ p = parse_iso6709(p, &longitude);
+ if (!p) {
+ continue;
+ }
+
+ if (!p || *p != '\t') {
+ continue;
+ }
+
+ /* name = string */
+ name = ++p;
+ while (*p != '\t' && *p && *p != '\n')
+ p++;
+
+ *p++ = '\0';
+
+ /* comment = string */
+ comment = p;
+ while (*p != '\t' && *p && *p != '\n')
+ p++;
+
+ if (*p == '\n' || *p == '\t')
+ *p = '\0';
+
+ hash = tz_hash(name);
+ i = malloc(sizeof *i);
+ memcpy(i->code, code, 2);
+ strncpy(i->name, name, sizeof i->name);
+ i->comment = strdup(comment);
+ i->longitude = longitude;
+ i->latitude = latitude;
+ i->next = li[hash];
+ li[hash] = i;
+ /* printf("%s [%u, %f, %f]\n", name, hash, longitude, latitude); */
+ }
+
+ return li;
+}
+
+/* Return location info from hash table, using given timezone name.
+ * Returns NULL if the name could not be found. */
+const struct location_info *find_zone_info(struct location_info **li,
+ const char *name)
+{
+ uint32_t hash = tz_hash(name);
+ const struct location_info *l;
+
+ if (!li) {
+ return NULL;
+ }
+
+ for (l = li[hash]; l; l = l->next) {
+ if (strcasecmp(l->name, name) == 0)
+ return l;
+ }
+
+ return NULL;
+}
+
+/* Since 5.3, php_date.c:timezone_identifiers_list() peeks directly
+ * into the data array at position + 4, which is the BC flag, so, we
+ * need to fake one up. For each timezone entry, the 'pos' entry will
+ * be set to either 0 or 1. pos + 4 will hence be either \1 or \0,
+ * respectively. Somewhat gross, but means we can avoid patching
+ * php_date.c. */
+static const unsigned char system_fake_data[] = "1234\1\0";
+#define SYSTEM_FAKE_BC_POS (0)
+#define SYSTEM_FAKE_NONBC_POS (1)
+
+/* Filter out some non-tzdata files and the posix/right databases, if
+ * present. */
+static int index_filter(const struct dirent *ent)
+{
+ return strcmp(ent->d_name, ".") != 0
+ && strcmp(ent->d_name, "..") != 0
+ && strcmp(ent->d_name, "posix") != 0
+ && strcmp(ent->d_name, "posixrules") != 0
+ && strcmp(ent->d_name, "right") != 0
+ && strstr(ent->d_name, ".tab") == NULL;
+}
+
+/* Create the zone identifier index by trawling the filesystem. */
+static void create_zone_index(timelib_tzdb *db)
+{
+ size_t dirstack_size, dirstack_top;
+ size_t index_size, index_next;
+ timelib_tzdb_index_entry *db_index;
+ char **dirstack;
+
+ /* LIFO stack to hold directory entries to scan; each slot is a
+ * directory name relative to the zoneinfo prefix. */
+ dirstack_size = 32;
+ dirstack = malloc(dirstack_size * sizeof *dirstack);
+ dirstack_top = 1;
+ dirstack[0] = strdup("");
+
+ /* Index array. */
+ index_size = 64;
+ db_index = malloc(index_size * sizeof *db_index);
+ index_next = 0;
+
+ do {
+ struct dirent **ents;
+ char name[PATH_MAX], *top;
+ int count;
+
+ /* Pop the top stack entry, and iterate through its contents. */
+ top = dirstack[--dirstack_top];
+ snprintf(name, sizeof name, ZONEINFO_PREFIX "/%s", top);
+
+ count = php_scandir(name, &ents, index_filter, php_alphasort);
+
+ while (count > 0) {
+ struct stat st;
+ const char *leaf = ents[count - 1]->d_name;
+
+ snprintf(name, sizeof name, ZONEINFO_PREFIX "/%s/%s",
+ top, leaf);
+
+ if (strlen(name) && stat(name, &st) == 0) {
+ /* Name, relative to the zoneinfo prefix. */
+ const char *root = top;
+
+ if (root[0] == '/') root++;
+
+ snprintf(name, sizeof name, "%s%s%s", root,
+ *root ? "/": "", leaf);
+
+ if (S_ISDIR(st.st_mode)) {
+ if (dirstack_top == dirstack_size) {
+ dirstack_size *= 2;
+ dirstack = realloc(dirstack,
+ dirstack_size * sizeof *dirstack);
+ }
+ dirstack[dirstack_top++] = strdup(name);
+ }
+ else {
+ const struct location_info *li;
+
+ if (index_next == index_size) {
+ index_size *= 2;
+ db_index = realloc(db_index,
+ index_size * sizeof *db_index);
+ }
+
+ db_index[index_next].id = strdup(name);
+
+ /* Look up the timezone in the zone.tab cache, and see
+ * whether this is a "BC" name or not; fake the pos
+ * pointer appropriately. */
+ li = find_zone_info(system_zone_info, name);
+ if (li) {
+ db_index[index_next].pos = SYSTEM_FAKE_NONBC_POS;
+ }
+ else {
+ db_index[index_next].pos = SYSTEM_FAKE_BC_POS;
+ }
+
+ index_next++;
+ }
+ }
+
+ free(ents[--count]);
+ }
+
+ if (count != -1) free(ents);
+ free(top);
+ } while (dirstack_top);
+
+ db->index = db_index;
+ db->index_size = index_next;
+ db->data = system_fake_data;
+
+ free(dirstack);
+}
+
+/* Return the mmap()ed tzfile if found, else NULL. On success, the
+ * length of the mapped data is placed in *length. */
+static char *map_tzfile(const char *timezone, size_t *length)
+{
+ char fname[PATH_MAX];
+ struct stat st;
+ char *p;
+ int fd;
+
+ if (strstr(timezone, "..") != NULL) {
+ return NULL;
+ }
+
+ snprintf(fname, sizeof fname, ZONEINFO_PREFIX "/%s", timezone);
+
+ fd = open(fname, O_RDONLY);
+ if (fd == -1) {
+ return NULL;
+ } else if (fstat(fd, &st) != 0 || st.st_size < 21) {
+ close(fd);
+ return NULL;
+ }
+
+ *length = st.st_size;
+ p = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
+ close(fd);
+
+ return p != MAP_FAILED ? p : NULL;
+}
+
+const timelib_tzdb *timelib_builtin_db(void)
+{
+ if (timezonedb_system == NULL) {
+ timelib_tzdb *tmp = malloc(sizeof *tmp);
+
+ tmp->version = "0.system";
+ tmp->data = NULL;
+ create_zone_index(tmp);
+ system_zone_info = load_zone_table();
+ timezonedb_system = tmp;
+ }
+
+ return timezonedb_system;
+}
+
+const timelib_tzdb_index_entry *timelib_timezone_builtin_identifiers_list(int *count)
+{
+ *count = timezonedb_system->index_size;
+ return timezonedb_system->index;
+}
+
+int timelib_timezone_id_is_valid(char *timezone, const timelib_tzdb *tzdb)
+{
+ char fname[PATH_MAX];
+
+ if (strstr(timezone, "..") != NULL) {
+ return 0;
+ }
+
+ snprintf(fname, sizeof fname, ZONEINFO_PREFIX "/%s", timezone);
+
+ return access(fname, R_OK) == 0 ? 1 : 0;
+}
+
+timelib_tzinfo *timelib_parse_tzfile(char *timezone, const timelib_tzdb *tzdb)
+{
+ char *orig;
+ const unsigned char *tzf;
+ timelib_tzinfo *tmp;
+ size_t len;
+ const struct location_info *li;
+
+ orig = map_tzfile(timezone, &len);
+ if (orig == NULL) {
+ return NULL;
+ }
+
+ tmp = timelib_tzinfo_ctor(timezone);
+
+ tzf = (const unsigned char *)orig + 20;
+ read_header(&tzf, tmp);
+ read_transistions(&tzf, tmp);
+ read_types(&tzf, tmp);
+
+ if ((li = find_zone_info(system_zone_info, timezone)) != NULL) {
+ tmp->location.comments = strdup(li->comment);
+ strncpy(tmp->location.country_code, li->code, 2);
+ tmp->location.longitude = li->longitude;
+ tmp->location.latitude = li->latitude;
+ tmp->bc = 1;
+ }
+ else {
+ strcpy(tmp->location.country_code, "??");
+ tmp->bc = 0;
+ tmp->location.comments = strdup("");
+ }
+
+ munmap(orig, len);
+
+ return tmp;
+}
+
+#else /* !HAVE_SYSTEM_TZDATA */
+
static int seek_to_tz_position(const unsigned char **tzf, char *timezone, const timelib_tzdb *tzdb)
{
int left = 0, right = tzdb->index_size - 1;
@@ -328,6 +764,7 @@ timelib_tzinfo *timelib_parse_tzfile(cha
return tmp;
}
+#endif
static ttinfo* fetch_timezone_offset(timelib_tzinfo *tz, timelib_sll ts, timelib_sll *transition_time)
{
--- php-5.3.0/ext/date/lib/timelib.m4.systzdata
+++ php-5.3.0/ext/date/lib/timelib.m4
@@ -78,3 +78,17 @@ stdlib.h
dnl Check for strtoll, atoll
AC_CHECK_FUNCS(strtoll atoll strftime)
+
+PHP_ARG_WITH(system-tzdata, for use of system timezone data,
+[ --with-system-tzdata[=DIR] to specify use of system timezone data],
+no, no)
+
+if test "$PHP_SYSTEM_TZDATA" != "no"; then
+ AC_DEFINE(HAVE_SYSTEM_TZDATA, 1, [Define if system timezone data is used])
+
+ if test "$PHP_SYSTEM_TZDATA" != "yes"; then
+ AC_DEFINE_UNQUOTED(HAVE_SYSTEM_TZDATA_PREFIX, "$PHP_SYSTEM_TZDATA",
+ [Define for location of system timezone data])
+ fi
+fi
+
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